ext4: mark multi-page IO complete on mapping failure

In mpage_da_map_and_submit(), if we have a delayed block
allocation failure from ext4_map_blocks(), we need to mark
the IO as complete, by setting

      mpd->io_done = 1;

Otherwise, we could end up submitting the pages in an outer
loop; since they are unlocked on mapping failure in
ext4_da_block_invalidatepages(), this will cause a bug check
in mpage_da_submit_io().

I tested this by injected failures into ext4_map_blocks().
Without this patch, a simple fsstress run will bug check;
with the patch, it works fine.

Signed-off-by: Curt Wohlgemuth <curtw@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index c6c6b7fcb455a121bc98bdce58f84a29c6078f52..fd369dbce6af211c0884fcab3f14be189f67888a 100644 (file)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2314,6 +2314,9 @@ static void mpage_da_map_and_submit(struct mpage_da_data *mpd)
                /* invalidate all the pages */
                ext4_da_block_invalidatepages(mpd, next,
                                mpd->b_size >> mpd->inode->i_blkbits);
+
+               /* Mark this page range as having been completed */
+               mpd->io_done = 1;
                return;
        }
        BUG_ON(blks == 0);